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183 lines
4.2 KiB
183 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* event.c - exporting ACPI events via procfs |
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* |
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* Copyright (C) 2001, 2002 Andy Grover <[email protected]> |
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]> |
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* |
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*/ |
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#define pr_fmt(fmt) "ACPI: " fmt |
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#include <linux/spinlock.h> |
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#include <linux/export.h> |
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#include <linux/proc_fs.h> |
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#include <linux/init.h> |
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#include <linux/poll.h> |
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#include <linux/gfp.h> |
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#include <linux/acpi.h> |
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#include <net/netlink.h> |
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#include <net/genetlink.h> |
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#include "internal.h" |
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/* ACPI notifier chain */ |
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static BLOCKING_NOTIFIER_HEAD(acpi_chain_head); |
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int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data) |
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{ |
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struct acpi_bus_event event; |
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strcpy(event.device_class, dev->pnp.device_class); |
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strcpy(event.bus_id, dev->pnp.bus_id); |
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event.type = type; |
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event.data = data; |
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return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event) |
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== NOTIFY_BAD) ? -EINVAL : 0; |
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} |
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EXPORT_SYMBOL(acpi_notifier_call_chain); |
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int register_acpi_notifier(struct notifier_block *nb) |
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{ |
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return blocking_notifier_chain_register(&acpi_chain_head, nb); |
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} |
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EXPORT_SYMBOL(register_acpi_notifier); |
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int unregister_acpi_notifier(struct notifier_block *nb) |
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{ |
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return blocking_notifier_chain_unregister(&acpi_chain_head, nb); |
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} |
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EXPORT_SYMBOL(unregister_acpi_notifier); |
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#ifdef CONFIG_NET |
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static unsigned int acpi_event_seqnum; |
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struct acpi_genl_event { |
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acpi_device_class device_class; |
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char bus_id[15]; |
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u32 type; |
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u32 data; |
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}; |
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/* attributes of acpi_genl_family */ |
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enum { |
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ACPI_GENL_ATTR_UNSPEC, |
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ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */ |
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__ACPI_GENL_ATTR_MAX, |
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}; |
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#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1) |
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/* commands supported by the acpi_genl_family */ |
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enum { |
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ACPI_GENL_CMD_UNSPEC, |
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ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */ |
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__ACPI_GENL_CMD_MAX, |
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}; |
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#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1) |
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#define ACPI_GENL_FAMILY_NAME "acpi_event" |
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#define ACPI_GENL_VERSION 0x01 |
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#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group" |
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static const struct genl_multicast_group acpi_event_mcgrps[] = { |
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{ .name = ACPI_GENL_MCAST_GROUP_NAME, }, |
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}; |
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static struct genl_family acpi_event_genl_family __ro_after_init = { |
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.module = THIS_MODULE, |
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.name = ACPI_GENL_FAMILY_NAME, |
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.version = ACPI_GENL_VERSION, |
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.maxattr = ACPI_GENL_ATTR_MAX, |
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.mcgrps = acpi_event_mcgrps, |
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.n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps), |
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}; |
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int acpi_bus_generate_netlink_event(const char *device_class, |
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const char *bus_id, |
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u8 type, int data) |
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{ |
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struct sk_buff *skb; |
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struct nlattr *attr; |
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struct acpi_genl_event *event; |
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void *msg_header; |
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int size; |
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/* allocate memory */ |
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size = nla_total_size(sizeof(struct acpi_genl_event)) + |
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nla_total_size(0); |
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skb = genlmsg_new(size, GFP_ATOMIC); |
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if (!skb) |
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return -ENOMEM; |
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/* add the genetlink message header */ |
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msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++, |
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&acpi_event_genl_family, 0, |
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ACPI_GENL_CMD_EVENT); |
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if (!msg_header) { |
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nlmsg_free(skb); |
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return -ENOMEM; |
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} |
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/* fill the data */ |
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attr = |
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nla_reserve(skb, ACPI_GENL_ATTR_EVENT, |
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sizeof(struct acpi_genl_event)); |
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if (!attr) { |
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nlmsg_free(skb); |
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return -EINVAL; |
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} |
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event = nla_data(attr); |
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memset(event, 0, sizeof(struct acpi_genl_event)); |
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strscpy(event->device_class, device_class, sizeof(event->device_class)); |
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strscpy(event->bus_id, bus_id, sizeof(event->bus_id)); |
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event->type = type; |
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event->data = data; |
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/* send multicast genetlink message */ |
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genlmsg_end(skb, msg_header); |
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genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC); |
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return 0; |
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} |
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EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
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static int __init acpi_event_genetlink_init(void) |
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{ |
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return genl_register_family(&acpi_event_genl_family); |
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} |
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#else |
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int acpi_bus_generate_netlink_event(const char *device_class, |
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const char *bus_id, |
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u8 type, int data) |
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{ |
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return 0; |
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} |
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EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
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static int acpi_event_genetlink_init(void) |
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{ |
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return -ENODEV; |
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} |
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#endif |
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static int __init acpi_event_init(void) |
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{ |
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int error; |
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if (acpi_disabled) |
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return 0; |
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/* create genetlink for acpi event */ |
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error = acpi_event_genetlink_init(); |
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if (error) |
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pr_warn("Failed to create genetlink family for ACPI event\n"); |
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return 0; |
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} |
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fs_initcall(acpi_event_init);
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